No no no... If you read it carefully and look at the drawings you will see that what Nagato is using is the same power that the path who fought Konohamaru use, only reversed and at a bigger scale. Just like the big Shinra Tensei and Planetary Devastation is the same technique as the universal attraction (used on Pa) only reversed and amplified. Pains and paths are not the same. Pains are the bodies, paths are the powers. There are 6 paths and 7 Pains, hence why the real one is not among them. Each of the Pains can use one of the Paths except for Nagato who can use all Paths. Got it?